pthread semaphore display nothing on linux

Question

I'm new to linux thread semaphore.

There is no error, no warning, and result output.

What cause this happen?

I suspect semaphore is blocked or infinite loop.

Anyone can see logic incorrect in some place?

initialise sem vlaue : bin_sem = 0, pile_sem = 0, fuel_sem = 0

sem_t bin_sem, pile_sem, fuel_sem;

int pile=0, fuel=0, wantedMineralVal=3, foundMineral=-1;


int isFound(void){
    srand(time(NULL));
    return (rand()%8+1);
}

void checkResource(){
    if(fuel!=0 && pile!=0)
        sem_post(&bin_sem); 
}

void *deliverFuel(void *args){
    while(foundMineral!=wantedMineralVal){      
        sem_wait(&fuel_sem);
        fuel+=24;
        checkResource();
    }
}

void *deliverPile(void *args){
    while(foundMineral!=wantedMineralVal){
        sem_wait(&pile_sem);
        pile+=12;
        checkResource();
    }
}

void *drilling(void *args){
    do{ 
        foundMineral =  isFound();
        if(pile == 0 || fuel==0){
            sem_post(&pile_sem);
            sem_post(&fuel_sem);
            sem_wait(&bin_sem);
        }

    pile-=2;
    fuel-=4;

    }while(foundMineral!=wantedMineralVal);

}